Diagnostic testing device



FIG. 1 is a top plan view of a diagnostic testing device showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a first side elevation view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a second side elevation view thereof; and,

FIG. 7 is a top and first side perspective view thereof.

The broken lines in the drawings depict portions of the diagnostic testing device that form no part of the claimed design. 

CLAIM The ornamental design for a diagnostic testing device, as shown and described. 